Jefferson County Map
The County of Jefferson is located in the State of Colorado. Find directions to Jefferson County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the Jefferson County population is estimated at 583,283 people. The Jefferson County time zone is Mountain Daylight Time which is 7 hours behind Coordinated Universal Time (UTC).
Nearby counties include Adams County, Arapahoe County, Boulder County, Broomfield County, Clear Creek County, Douglas County, Gilpin County, Park County, Teller County.
Top cities include Lakewood, Arvada, Wheat Ridge, Golden, Edgewater